Mössbauer study of the magnetic character and ordering process of the cubic γ- phase obtained by Fe implantation into a Si(100) matrix
Phys. Rev. B 54, 11659 – Published 15 October, 1996
DOI: https://doi.org/10.1103/PhysRevB.54.11659
Abstract
The magnetic character and the ordering process of γ- precipitates formed by Fe implantation into Si(100) followed by ion-beam epitaxial crystallization (IBIEC) have been studied using the Mössbauer technique. Measurements performed at 4 K have shown no evidence of magnetic interaction indicating that the γ- phase is not of magnetic character. Conversely, conversion-electron Mössbauer experiments performed after the IBIEC procedure show basically the presence of a doublet, despite the cubic structure of the γ- precipitates. However, after 1 h of annealing at 600 °C, a singlet, which before was barely recognizable, became more pronounced. The singlet-to-doublet proportion increases with increasing Fe concentration (2 at. %⩽⩽8.5 at. %), indicating that after annealing a better ordering in theγ- precipitates is achieved. This ordering is obtained by an adequate combination of Fe-implanted concentration and thermal annealing. These studies have been complemented by Rutherford backscattering and/or channeling and transmission electron microscopy experiments. © 1996 The American Physical Society.